Table 1. GEOS/OCO-2 February–May regional reductions in XCO2 growth and associated uncertainties.
Reductions and uncertainties are calculated from the data depicted in Fig. 3 as the peak 2020 reduction (solid boxes) and peak 1σ 2017–2019 uncertainty (gray shading) during February–May (see Materials and Methods). Start dates and end dates are taken from activity data (3). The average reduction over all four regions is 0.38 ppm, and average uncertainty is 0.24 ppm, giving a 1σ range of 0.14 to 0.62 ppm for the reduction over the Northern Hemisphere.
| Peak reduction | Peak 1σ uncertainty | Start | End | |
| China | 0.37 ppm | 0.26 ppm | January 25 | March 25 |
| Western Europe | 0.32 ppm | 0.32 ppm | March 13 | May 20 |
| United States | 0.42 ppm | 0.14 ppm | March 21 | May 16 |
| Russia | 0.41 ppm | 0.22 ppm | March 31 | May 15 |